The Tragedy of King Lear

Lear. Go you before to Gloucester with these letters. Acquaint my
daughter no further with anything you know than comes from her
demand out of the letter. If your diligence be not speedy, I
shall be there afore you.

Earl of Kent. I will not sleep, my lord, till I have delivered your letter. Exit.
885

Fool. If a man's brains were in's heels, were't not in danger of
kibes?